In fact, there are many sapphire color improvement technologies in the world. For example, the HPHT treatment method that Song Tao previously studied was to turn light sapphires into rich sapphires.

However, there is a common problem with the current sapphire color improvement technology, that is, it can only change from shallow to dark, but not from dark to shallow.

To put it bluntly, it is easy to add color-producing elements to it, but it is very difficult to extract color-producing elements.

A scholar named Guan Lingling once studied Yingqiu sapphire and used plasma implantation to inject titanium elements into the surface of the sapphire, diluting the iron element that causes blackening, thereby improving the color of Yingqiu sapphire.

But the effect is still far from having commercial value.

After the improvement of the plasma implantation method, the Yingqiu sapphire can barely see that these are blue stones, rather than black gems of unknown varieties, which is a considerable improvement.

But that's all.

Since Professor Guan Lingling made an improvement on these sapphires four years ago, no one has ever asked about these sapphires.

Thinking of this, Song Tao frowned. The methods of handling various gems in the world today are so complicated. He would not believe it if everyone could not find a way. To put it bluntly, it would be that he did not pay enough attention.

But he is helpless at the moment. After all, this kind of research requires the attention of the country to succeed. Now he is alone, even if he is willing, he will be helpless.

At that time, whether it was HPHT, Hetian jade origin identification, or broadband induced luminescent instrument, he used a large number of resources from the quality inspection station to complete it. He alone, even if he owned the system, was destined to achieve nothing.

The next day, Song Tao sent the staff back to Huachang Dida University and brought his camera to the mining area.

After getting off the car, Song Tao walked forward and carried a camera alone. At this time, Yingqiu County was still early spring, and the wind blew on Song Tao's face, and it was a little cold.

So desolate.

Song Tao smiled helplessly.

However, after turning a hill, a cheer suddenly scared Song Tao.

"Welcome experts from the Ministry to come and guide!" About 100 people lined up in front of a mining site to welcome Song Tao's arrival, and then there was a burst of warm applause.

The person in the leader was stunned for a moment after seeing Song Tao. He might not have expected that the expert in the department was so young, but he reacted in less than two seconds and brought these workers to warmly welcome him.

Song Tao knew that the one in front should be the person in charge of the mining area, so he hurried over to shake hands and said a little apologetically: "Sorry, it was indeed sent by the Ministry, but I am not an expert, but just a staff member of Huachangdida."

"Ah?" The person in charge named Li Yuan was a little surprised and said, "No, we received a notice from the county that there will be young experts from the ministry here to guide us today."

As he said that, he took out his cell phone, opened a stored photo, compared it to Song Tao's face, and then smiled honestly: "Yes, there is nothing wrong with it, isn't this you?"

Song Tao quickly looked at the photos on the phone, and then smiled helplessly. Unexpectedly, Yingqiu County even thoughtfully passed on his photo, and it was a very ugly formal photo.

It seems that there is no way to keep a low profile today, at least we have to do the whole day of research honestly.

"Hello, Expert Song, I am Li Yuan, the second person in charge of the mining area. Our main person in charge has to go on a business trip for a while because he has something to do, so he has no way to greet you in person." Li Yuan said a little apologetically.

Song Tao quickly grabbed his hand, then shook his head and said, "Master Li, you really don't need to call me an expert. I am the head of the Technical Service Section of the Research Department of the Huachangdi Quality Inspection Center. I am just here to do some initial investigations."

However, Song Tao's words made Li Yuan and the miners even more excited. They thought this was a very remarkable position: "Huachang Di University? Scientific Research Department? Technical Service Department?"

"Oh, look at the name, the technical service department, and it is from Huachang Land. This must be an expert in technology." Li Yuan laughed at this point.

A worker behind also echoed: "Scholars must be more modest, but in fact they are better than the other."

Song Tao smiled helplessly. Since they unanimously believed that they were experts and the eight carriages could not be pulled back, they stopped correcting them and said, "Master Li, then let's get to the point and see the situation in the mining area."

Li Yuan nodded repeatedly and said yes, and then someone took off the camera of Song Tao's quilt and took it with someone else instead of Song Tao.

Song Tao followed Li Yuan to the mining site, and the two chatted about the situation in the mining area along the way.

"The mining area in Yingqiu was discovered when I was in high school. At that time, my parents' generation said it was sapphire. We in Yingqiu County were going to make a fortune. I didn't believe it at that time, where did the sapphire come from?"

Song Tao smiled and said, "In fact, the sapphire on Yingqiu is the largest grain and the highest clarity in the world."

"The color is also the worst." Li Yuan added actively.

"When the mine was just discovered, people from all over the county came to dig it, but within two days the county sent police to strictly guard it. Even the army was dispatched to the forefront, for fear that someone would steal it."

"Later, after the county organized mining, the first batch of goods were sold. All of us thought we could sell at a sky-high price, but who knew that we didn't even sell one tenth. I heard that our stone was not as practical as pebbles, and we could be a fish tank stone if we could endure it."

Song Tao said dismissively: "This is their nonsense."

No matter how bad the sapphire is, it is still a sapphire. Its value is still not comparable to pebbles or ordinary crystals.

Li Yuan nodded with consent: "It's true that they were talking nonsense. Later, they dug up several batches one after another, and the sales volume was a little better, but the price had to be lowered before it could be sold. Since then, everyone in the county has known that this thing is not worth anything at all."

"So, the police force and soldiers behind have all withdrawn, and there is no need to guard them. Even if the mine is left there for nothing, no one will ask for it." Li Yuan said with some emotion.

Song Tao thought for a while and said, "Then what is the situation in the mining area now?"

Li Yuan replied: "In the past few years, the county attached great importance to it. It was held a sapphire city. I wanted to use sapphire to attract tourists to mine. I said, "Isn't this a mess? Who has nothing to do to come here to knock stones?"

"But don't say it, there are tourists in the province who really use hammers to knock. We will be tired of knocking them all our lives, and they are very happy to knock them." Li Yuan complained.

Song Tao couldn't help laughing when he heard this. He hadn't heard of how he dared to play in the sapphire mining area like this.

However, Li Yuan added: "At the beginning, there were a lot of tourists, but later they spent it freshly, and fewer and fewer people joined in the fun."

"Until later, a professor at the Peking University named Guan Lingling came."
Chapter completed!